Knob attachment



' (Model.)

J. G. FOX.

KNOB ATTACHMENT.

No. 269,516. Patented Dec.26,1882.

-45 fruitig-plate, C', is applied, this plate being` UNITED STATESPATENT EETCE.

JACOB G. FOX, OF BAY CITY, ASSIGNOR OF A PART TO ISAAC M. HENDER- SONANDEDMUND W. HENDERSON, OF DETROIT, AND GEORGEv P. CHAP- MAN AND HORACEE. HATCH, OF

LAPEER, MToHtcAN.

KNOB ATTACHMENT'.

SPECIFICATION forming part of Letters Patent No. 269,516, dated December26, 1882.

Application filed August 24, 1882.

To all whom 'it may concern Beit known that I, JACOB G. FOX, a citizenof the United States, residing at Bay Cit-y, in the county of Bay andState of Michigan, have invented a new and Improved Means for AttachingDoorKnobs to Spindles, of which the .following is a specication.

The nature ot' my invention consists in certain features of constructioncombined', as will 1o be hereinafter set forth, and particularly pointedout in the claim.

The object of my invention is to overcome the inconvenience andannoyance of knobs becoming detached from their spindles by sudden jarsand frequent turning, and this object I attain by the means illustratediu the accompanying' drawings, in which- Figurelis alongitudinal sectionthrough the detachable knob, and showing also the spinzo dle and theknob, which is permanently fastened to it, the spindle being so turnedas to show three ofits corners; and Fig. 2 is atransverse sectionthrough the knob-spindle, and showing the detachable knob in endelevation;

and Fig. 3 is a modilication otl the internallyscrew-threaded tube.

4A in the drawings represents a doonknob spindle, with a knob, B,permanently fastened to it in any suitable manner. This spindle is 3o otsquare or prism-atie form, and provided with segments of a screw-thread,a, on its corners, as shown.

B represents a detachable knob, which is provided with a revolving tube,b, having a screw-thread, b', on its inner surface, and a stop-collar,b2, on its periphery, near its inner end,and a solid end,b3,in which anick, b4, i'or a screw-driver, is cut, as shown. The screwthreaded tubeb is fitted in the central bore of 4o the knob B', its collar I)2abutting against the inner face of the knob,while its solid end b3extends out beyond the outer face ofthe same through a. rivetingplate,C, as shown.

Against the collar b2 a rosetteshaped conprovided with a shank having acentral prismatic passage, j', which terminates in a cylindricalsocket,f, as shown. The prismatic passage corresponds to the shape andsize of the (Model.)

spindle, while the socket corresponds to the shape and size of thecollar.

The plates C and C are united to the knob B by rivets g, and thusconfine the revolving tube b in place and against longitudinal movenientwithout interfering with its revolution. 5;

In order to fasten the knobs B and B' together, the spindle A, havingthe permanent knob B attached to it, is passed through the door and intothe square openingfof the shank ot' the riveting-plate C' ot' knob B.Then by placing a screw-driver in the nick b4 of the protruding eudofthe revolving tube b and turning thersame the knobs will be drawntogether by the segmental threads. a of the spindle A screwing into thethreads of said tube b, and thus drawn together they-will be securelyheld, as the square spindle cannot turn in the knob, and the tubebwillnot be turned independently ot' the knob or spindle when the knobs areoperated lf'or the usual purpose.

A wearing-bearing forthe revolving tube b may be provided within'thebore of the knob B', if desired; and instead of nicking the solid endofthe revolvinginternally-screw-threaded tube b, said end of the tubemay be provided with a button ot' prismatic or circular form, so thatthe tube may be operated from the outside ofthe knob by hand orotherwise.

The invention I have described and shown aords a very convenient andpermanent fastening for the detachable knob B without adding greatexpense.

ln Fig. 3 I have shown an equivalent plan of construction to that showniu the other iigures, the internallyscrewthreaded tube being providedwith a shoulder, b5, near its nicked end, and when this construction isadopted the collar b2 will be dispensed with, as the shoulder willprevent the tube moving longitudinallv.

`The confining-plate with prismatic passage in its shank maybe fastenedin position by any of the well-known means, and my invention is notconfined to the precise style or construction l of knob shown anddescribed.

My invention differs fi om ordinary knobs provided With aiXing-screwinserted from the outer side ot the knob, and which screw can be turnedbackward out ofthe knob. ln my knob the fixingscrew serves both as a nutfor the spindle and as a means for fixing the knob upon the spindle, andwhen tbe knob is in use the fixing-screw cannot move longitudinally ineither direction, and in this respect it is novel ,and more advantageousthan ordinary knobs.

Vhat I claim asmy invention, and desire to secure by Letters Patent, is

The combination, with a knob spindle of prisinatic form andscrew-threaded at its corners, of a detachable knob having a shank onits conlining-platc, with prismatic passage in it, and provided with acenter tube, which is screw-threaded internally, made smooth andcylindrical externally,providedwth means fory holding it, while the knobis in position, from longitudinal movement in either direction, While itis allowed to revolve Within the knob, and constructed With a prgtrudingend, by which it is operated from the outside of the knob, substantiallyas described.

JACOB G. FOX.

Witnesses:

W. M. KELLEY, E. W. HENDERSON.

